from flask import render_template, session, current_app, g, abort, request, jsonify

from info import constants, db
from info.models import User, News, Category, Comment, CommentLike
from info.modules.news import news_blu
from info.utils.common import user_login_data
from info.utils.response_code import RET


@news_blu.route("<int:news_id>",methods=["GET"])
@user_login_data
def news_detail(news_id):
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        abort(404)

    if not news:
        #返回数据未找到的页面
        abort(404)

    news.clicks += 1

    #显示新闻列表页
    news_list = None
    try:
        news_list = News.query.order_by(News.clicks.desc()).limit(constants.CLICK_RANK_MAX_NEWS)
    except Exception as e:
        current_app.logger.error(e)
    news_dict_li= []
    #遍历对象列表，将对象的字典添加到字典列表中
    for new in news_list if news_list else []:
        news_dict_li.append(new.to_basic_dict())

    #获取新闻分类数据
    categories = Category.query.all()

    #定义列表保存分类数据
    categories_dicts = []
    #
    for category in categories:
        #拼接内容
        categories_dicts.append(category.to_dict())

    #获取当前新闻的评论
    comments = []
    try:
        comments = Comment.query.filter(Comment.news_id == news_id).order_by(Comment.create_time.desc()).all()
    except Exception as e:
        current_app.logger.error(e)

    #开始用户点赞逻辑（前端变量：action = "add"，comment_id，news_id，）
    #评论的点赞列表
    comment_like_ids= []
    if g.user:
        #如果当前用户已登录
        try:
            comment_ids=[comment.id for comment in comments]
            if len(comment_ids) > 0:
                #取到当前用户在当前新闻的所有评论点赞的记录
                comment_likes =CommentLike.query.filter(CommentLike.comment_id.in_(comment_ids),
                                                        CommentLike.user_id==g.user.id).all()

                #取出记录中所有的评论id
                comment_like_ids= [comment_like.comment_id for comment_like in comment_likes]
        except Exception as e:
            current_app.logger.error(e)


    comment_list = []
    for item in comments if comments else []:
        comment_dict = item.to_dict()
        comment_dict["is_like"] = False
        #判断用户是否点赞评论
        if g.user and item.id in comment_like_ids:
            comment_dict["is_like"] = True
        comment_list.append(comment_dict)

    #判断是否收藏该新闻，默认值为false
    is_collected = False
    #判断用户是否收藏过该新闻
    if g.user:
        if news in g.user.collection_news:
            is_collected = True

    data = {
            "news": news.to_dict(),
            "user_info":g.user.to_dict() if g.user else None,
            "news_dict_li":news_dict_li,
            "is_collected": is_collected,
            "comments": comment_list,
            "categories": categories_dicts
            }
    return render_template("news/detail.html",data = data)


@news_blu.route("/news_collect",methods=["POST"])
@user_login_data
def news_collect():
    """新闻收藏"""

    user= g.user
    json_data = request.json
    news_id = json_data.get("news_id")
    action = json_data.get("action")

    if not user:
        return jsonify(errno= RET.SESSIONERR,errmsg="用户未登录")

    if not news_id:
        return jsonify(errno= RET.PARAMERR,errmsg="参数错误1")

    if action not in ("collect","cancel_collected"):
        print("action: %s" % action)
        return jsonify(errno=RET.PARAMERR,errmsg="参数错误2")

    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno= RET.DBERR,errmsg="查询数据失败")

    if not news:
        return jsonify(errno= RET.NODATA,errmsg="新闻数据不存在")

    if action =="collect":
        user.collection_news.append(news)
    else:
        user.collection_news.remove(news)

    try:
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()
        return jsonify(errno=RET.DBERR, errmsg="保存失败")
    return jsonify(errno=RET.OK, errmsg="操作成功")


@news_blu.route("/news_comment",methods=["POST"])
@user_login_data
def add_news_comment():
    """添加评论"""

    user= g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR,errmsg="用户未登录")

    #获取参数
    data_dict = request.json
    news_id = data_dict.get("news_id")
    comment_str = data_dict.get("comment")
    parent_id = data_dict.get("parent_id")

    if not all([news_id,comment_str]):
        return jsonify(errno=RET.PARAMERR,errmsg="参数不足")

    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="查询数据失败")

    if not news:
        return jsonify(errno=RET.NODATA,errmsg="该新闻不存在")

    #初始化模型，保存数据
    comment = Comment()
    comment.user_id = user.id
    comment.news_id = news_id
    comment.content = comment_str
    if parent_id:
        comment.parent_id = parent_id

    #保存到数据库
    try:
        db.session.add(comment)
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR,errmsg="保存评论数据失败")

    #返回响应
    return jsonify(errno=RET.OK,errmsg="评论成功",data= comment.to_dict())

@news_blu.route("/comment_like",methods=["POST"])
@user_login_data
def set_comment_like():
    """评论点赞"""

    if not g.user:
        return jsonify(errno=RET.SESSIONERR, errmsg="用户未登录")


    #获取参数
    comment_id = request.json.get("comment_id")
    news_id = request.json.get("news_id")
    action = request.json.get("action")

    #判断参数
    if not all([comment_id,news_id,action]):
        return jsonify(errno=RET.PARAMERR,errmsg="参数不足")

    if action not in("add","remove"):
        return jsonify(errno=RET.PARAMERR,errmsg="非法的参数请求")

    #查询评论数据
    try:
        comment = Comment.query.get(comment_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg="查询数据失败")

    if not comment:
        return jsonify(errno=RET.DATAERR,errmsg="此评论不存在")

    #添加点赞条数
    if action == "add":
        comment_like = CommentLike.query.filter_by(comment_id=comment_id,user_id = g.user.id).first()
        if not comment_like:
            comment_like= CommentLike()
            comment_like.comment_id = comment_id
            comment_like.user_id = g.user.id
            db.session.add(comment_like)
            # 增加点赞条数
            comment.like_count += 1
    else:
        #删除点赞条数
        comment_like = CommentLike.query.filter_by(comment_id=comment_id,user_id=g.user.id).first()
        if comment_like:
            db.session.delete(comment_like)
            #减小点赞条数
            comment.like_count -= 1

    try:
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()
        return jsonify(errno=RET.DBERR, errmsg="操作失败")
    return jsonify(errno=RET.OK,errmsg="操作成功")

















